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Measurements of ammonia in supernatant fluids of UA159 incubated with 50 mM glucose (glc), 50 mM GlcNAc, or 50 mM GlcN. The data are averages of results of three independent experiments, with error bars indicating the standard deviation. *, P < 0.05; **, P < 0.005 (by the Student t test).
